Home / Products / Impurities

Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Impurities, Zolpidem

Zolpidem Impurity E

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 83192-85-2

Mol F.

: C₁₃H₁₅NO₂

Mol W.

: 217.26

Cat No.

: SA43007

Impurities, Zolpidem

Zolpyridine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 349122-64-1

Mol F.

: C14H14N2O

Mol W.

: 226.27

Cat No.

: SA43003

Impurities, Zopiclone

Zopiclone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 43200-80-2

Mol F.

: C17H17ClN6O3

Mol W.

: 388.81

Cat No.

: SA38700

Impurities, Zopiclone

Zopiclone EP impurity A

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 43200-96-0

Mol F.

: C17H17ClN6O4

Mol W.

: 404.81

Cat No.

: SA38701

Impurities, Zopiclone

Zopiclone EP impurity B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 43200-81-3

Mol F.

: C11H7ClN2O4

Mol W.

: 262.65

Cat No.

: SA38702

Impurities, Zopiclone

Zopiclone EP impurity C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 148891-53-6

Mol F.

: C11H7ClN4O

Mol W.

: 246.65

Cat No.

: SA38703

Impurities, Levothyroxine

α-Amino-4-hydroxy-3,5-diiodo-benzeneacetic Acid

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 854646-83-6

Mol F.

: C8H7I2NO3

Mol W.

: 418.96

Cat No.

: SA24726

Flurbiprofen, Impurities

α-Desmethyl 3’,4’-Dimethoxy Flurbiprofen

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1346604-78-1

Mol F.

: C16H14FO4

Mol W.

: 290.29

Cat No.

: SA14611

Flurbiprofen, Impurities

α-desmethyl Flurbiprofen

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 5001-96-7

Mol F.

: C14H11FO2

Mol W.

: 230.23

Cat No.

: SA14618

Impurities, Levothyroxine

α-Hydroxy-4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodo-N-methyl-benzeneacetamide

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2088032-68-0

Mol F.

: C15H11I4NO4

Mol W.

: 776.87

Cat No.

: SA24727

Impurities, Tiotropium

α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester

$595.00 25 mg

PLEASE ENQUIRE

CAS No.

: 783273-13-2

Mol F.

: C18H19NO4S2

Mol W.

: 377.48

Cat No.

: SA11718

Impurities, Tamoxifen

β-Hydroxy Tamoxifen

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 97151-03-6

Mol F.

: C26H29NO2

Mol W.

: 387.51

Cat No.

: SA35513

Cephalexin, Impurities

Δ-2-7-Aminodesacetoxycephalosporanic Acid

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 56487-68-4

Mol F.

: C8H10N2O3S

Mol W.

: 214.24

Cat No.

: SA12011

Ethinylestradiol, Impurities

Δ-6(7)-18-Methyl Ethinylestradiol

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1175128-91-2

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA13113

Estradiol Valerate, Impurities

δ-6(7)-Dehydroestradiol divalerate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

Mol F.

: C28H38O4

Mol W.

: 438.6

Cat No.

: SA14011

Estrone, Impurities

δ-6(7)-Estrone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2208-12-0

Mol F.

: C18H20O2

Mol W.

: 268.35

Cat No.

: SA16012

Impurities, Nandrolone

δ-6(7)-Nandrolone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 14531-84-1

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA16304

Estrone, Impurities

δ-8(9)-Dehydroestrone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 474-87-3

Mol F.

: C18H20O2

Mol W.

: 268.3

Cat No.

: SA16003

Estrone, Impurities

δ-8(9)-Dehydroestrone Sodium Sulfate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 61612-83-7

Mol F.

: C18H19NaO5S

Mol W.

: 370.4

Cat No.

: SA16001

Estrone, Impurities

δ-9(11)-18-Methyl estrone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 19882-81-6

Mol F.

: C19H22O2

Mol W.

: C19H22O2

Cat No.

: SA16008

Estradiol Valerate, Impurities

δ-9(11)-Dehydroestradiol-3,17b-divalerate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1373116-15-4

Mol F.

: C28H38O4

Mol W.

: 438.6

Cat No.

: SA14014

Estrone, Impurities

δ-9(11)-Dehydroestrone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1089-80-1

Mol F.

: C18H20O2

Mol W.

: 268.4

Cat No.

: SA16004

Estrone, Impurities

δ-9(11)-Estrone sulfate piperazine salt

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1313382-30-7

Mol F.

: C22H30N2O5S

Mol W.

: C22H30N2O5S

Cat No.

: SA16002

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 34184-82-2

Mol F.

: C21H28O3

Mol W.

: 328.44

Cat No.

: SA38408

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone Acetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 130145-14-1

Mol F.

: C24H30O4

Mol W.

: 382.49

Cat No.

: SA38409

Impurities, Progesterone

Δ8,9-Progeterone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 83603-61-6

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18020

Eplerenone, Impurities

Δ9-Canrenone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 95716-71-5

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA41803

Atropine, Impurities

ψ-Tropine

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 135-97-7

Mol F.

: C8H15NO

Mol W.

: 141.21

Cat No.

: SA47708

Carfilzomib

Carfilzomib (2R,4S) Hydroxysuccinic Acid Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C46H65N5014

Mol W.

: 912.05

Cat No.

: SA45016

Carfilzomib

Carfilzomib (2S,4R) Diol Isomer

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C40H59N5O8

Mol W.

: 737.94

Cat No.

: SA45018

Carfilzomib

Carfilzomib Morpholinoacetamido L-leucine Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1396006-47-5

Mol F.

: C22H33N3O5

Mol W.

: 419.5

Cat No.

: SA45017

Emtricitabine

Emtricitabine Asymmetric Methylene Dimer | CAS : 1962114-96-0

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1962114-96-0

Mol F.

: C17H20F2N6O6S2

Mol W.

: 506.5

Cat No.

: SA22934

Emtricitabine

Emtricitabine Desamino (R)-Sulfoxide Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C8H9FN2O4S

Mol W.

: 248.2

Cat No.

: SA22935

Etoricoxib

Etoricoxib Bis-Sulfonylphenyl Terpyridine Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C31H27N3O4S2

Mol W.

: 569.69

Cat No.

: SA41608

Hydrocortisone

Hydrocortisone Sodium Phosphate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 6000-74-4

Mol F.

: C21H29Na2O8P

Mol W.

: 486.40

Cat No.

: SA15234

Mirabegron

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 223673-61-8

Mol F.

: C21H24N4O2S

Mol W.

: 396.51

Cat No.

: SA53100

Mirabegron

Mirabegron EP Impurity A

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1796931-48-0

Mol F.

: C21H24N4O2S

Mol W.

: 396.51

Cat No.

: SA53101

Mirabegron

Mirabegron EP Impurity B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 391901-45-4

Mol F.

: C16H20N2O

Mol W.

: 256.34

Cat No.

: SA53102

Mirabegron

Mirabegron EP Impurity C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1581284-82-3

Mol F.

: C21H24N4OS

Mol W.

: 380.51

Cat No.

: SA53103

Mirabegron

Mirabegron EP Impurity D

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2489747-26-2

Mol F.

: C26H28N6O3S2

Mol W.

: 536.67

Cat No.

: SA53104

Mirabegron

Mirabegron EP Impurity E

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 24954-67-4

Mol F.

: C8H10N2O2

Mol W.

: 166.18

Cat No.

: SA53105

Mirabegron

Mirabegron EP Impurity F

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 223673-34-5

Mol F.

: C16H18N2O3

Mol W.

: 286.33

Cat No.

: SA53106

Mirabegron

Mirabegron EP Impurity G

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 521284-19-5

Mol F.

: C16H16N2O4

Mol W.

: 300.31

Cat No.

: SA53107

Impurities, Ritlecitinib

N-((3R)-1-benzyl-6-methylpiperidin-3-yl)-7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-amine

Please enquire for price & pack size

Not Available

CAS No.

Mol F.

: C26H29N5O2S

Mol W.

: 475.61

Cat No.

: SA50009

Omeprazole

N-Methyl Omeprazole (Mixture of Isomers)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 784143-42-6

Mol F.

: C18H21N3O3S

Mol W.

: 359.44

Cat No.

: SA19417

Azithromycin

N-Nitroso Azithromycin EP Impurity A

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C37H69N3O13

Mol W.

: 763.96

Cat No.

: SA10316

Diazepam

N-Nitroso Diazepam EP Impurity D

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 51145-18-7

Mol F.

: C14H11ClN2O2

Mol W.

: 274.7

Cat No.

: SA20509

Vortioxetine

N-Nitroso Vortioxetine Sulfoxide

$395.00 50 mg

In Stock

CAS No.

Mol F.

: C18H21N3O2S

Mol W.

: 343.44

Cat No.

: SA50302

Cefadroxil

N-Phenylglycyl Delta-3 Cefadroxil (USP)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C24H24N4O7S

Mol W.

: 512.53

Cat No.

: SA42315

Sitagliptin

Sitagliptin Trifluorobenzoic Acid Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 2428591-91-5

Mol F.

: C9H5F3O4

Mol W.

: 234.1

Cat No.

: SA10459